{"id":11234,"date":"2013-06-14T11:18:57","date_gmt":"2013-06-14T18:18:57","guid":{"rendered":"http:\/\/www.preposterousuniverse.com\/blog\/?p=11234"},"modified":"2013-06-14T11:18:57","modified_gmt":"2013-06-14T18:18:57","slug":"there-is-no-classical-world","status":"publish","type":"post","link":"https:\/\/preposterousuniverse.com\/blog\/2013\/06\/14\/there-is-no-classical-world\/","title":{"rendered":"There Is No Classical World"},"content":{"rendered":"<p>Caltech&#8217;s Institute for Quantum Information and Matter is a fun place. It&#8217;s led by people like John Preskill, Jeff Kimble, and Alexei Kitaev &#8212; some of the world&#8217;s great scientists &#8212; so you know the physics is going to be top-notch. But it&#8217;s the youngsters, such as postdoc <a href=\"https:\/\/plus.google.com\/110536759798064015773\/posts\">Spiros Michalakis<\/a>, who are bringing the fun. Suff like the <a href=\"http:\/\/quantumfrontiers.com\/\">IQIM blog<\/a> (where you should read John&#8217;s recent post on the <a href=\"http:\/\/quantumfrontiers.com\/2013\/06\/07\/entanglement-wormholes\/\">Maldadcena\/Susskind wormhole proposal<\/a>) and a successful Kickstarter campaign for <a href=\"http:\/\/www.kickstarter.com\/projects\/1050596163\/project-x-squared-0\">science-inspired fashion<\/a>. <\/p>\n<p>The fun is now being ratcheted up even higher, as <a href=\"http:\/\/quantumfrontiers.com\/2013\/06\/11\/quantum-matter-animated\/\">IQIM is teaming<\/a> with <a href=\"http:\/\/jorgecham.com\/\">Jorge Cham<\/a> of <a href=\"http:\/\/www.phdcomics.com\/comics.php\">PhD Comics fame<\/a> to make a series of animated web videos about quantum mechanics. I ask you, who doesn&#8217;t love some good videos about quantum mechanics??<\/p>\n<p>Sensibly, they&#8217;ve kicked off by spotlighting an interesting experimental result, rather than diving right into the realms of esoteric theoretical speculation. Of course, this is quantum mechanics we&#8217;re talking about, so even the experiments get pretty wild in their implications. The work is by <a href=\"http:\/\/copilot.caltech.edu\/\">Amir Safavi-Naeini and Oskar Painter<\/a>, who take a small mirror and put it into a quantum state where its center of mass is as cold as it is possible to be. Classically, of course, the mirror can be perfectly still; quantum-mechanically, there is a ground state wave function that still shows &#8220;fluctuations&#8221; (i.e. the fact that observations won&#8217;t always show zero motion). <\/p>\n<div class=\"lyte-wrapper\" title=\"Doing The Impossible\" style=\"width:640px;max-width:100%;margin:5px;\"><div class=\"lyMe\" id=\"WYL_pktWhH6m_DM\" itemprop=\"video\" itemscope itemtype=\"https:\/\/schema.org\/VideoObject\"><div><meta itemprop=\"thumbnailUrl\" content=\"https:\/\/i.ytimg.com\/vi\/pktWhH6m_DM\/hqdefault.jpg\" \/><meta itemprop=\"embedURL\" content=\"https:\/\/www.youtube.com\/embed\/pktWhH6m_DM\" \/><meta itemprop=\"duration\" content=\"PT5M53S\" \/><meta itemprop=\"uploadDate\" content=\"2013-06-11T07:04:28Z\" \/><\/div><div id=\"lyte_pktWhH6m_DM\" data-src=\"https:\/\/i.ytimg.com\/vi\/pktWhH6m_DM\/hqdefault.jpg\" class=\"pL\"><div class=\"tC\"><div class=\"tT\" itemprop=\"name\">Doing The Impossible<\/div><\/div><div class=\"play\"><\/div><div class=\"ctrl\"><div class=\"Lctrl\"><\/div><div class=\"Rctrl\"><\/div><\/div><\/div><noscript><a href=\"https:\/\/youtu.be\/pktWhH6m_DM\" rel=\"nofollow\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i.ytimg.com\/vi\/pktWhH6m_DM\/0.jpg\" alt=\"Doing The Impossible\" width=\"640\" height=\"340\" \/><br \/>Watch this video on YouTube<\/a><\/noscript><meta itemprop=\"description\" content=\"Our new PODCAST: https:\/\/link.podtrac.com\/SciStuff_PHD_Comics ORDER our new book: https:\/\/tinyurl.com\/OutMindBook Physicists Amir Safavi-Naeini and Oskar Painter describe how they were able to measure quantum motions of 1 femtometer (0.000000000000001 meters) in a micro-scale object. Subscribe: http:\/\/www.youtube.com\/subscription_center?add_user=phdcomics More at: http:\/\/phdcomics.com\/tv Animated by Jorge Cham: http:\/\/jorgecham.com Featuring: Amir Safavi-Naeini and Oskar Painter http:\/\/copilot.caltech.edu\/ Produced in Partnership with the Institute for Quantum Information and Matter (http:\/\/iqim.caltech.edu) at Caltech with funding provided by the National Science Foundation. Transcription: Noel Dilworth Thanks to: Spiros Michalakis, John Preskill and Bert Painter #FQXiVideoContest2014\"><\/div><\/div><div class=\"lL\" style=\"max-width:100%;width:640px;margin:5px;\"><\/div><\/p>\n<p>Now, the mirror is tiny &#8212; microscopic, it&#8217;s fair to say &#8212; but it&#8217;s not <em>that<\/em> tiny. It&#8217;s a piece of metal, non just an atom or two. (I didn&#8217;t catch what the actual size was.) So the implication here is that things don&#8217;t miraculously &#8220;become classical&#8221; when they are made of many atoms rather than just a few. We don&#8217;t notice the quantum-ness of the universe in our everyday lives, but that&#8217;s because the systems we encounter are noisy and constantly jostled by their environments, leading to rapid decoherence; not because there is a magical transition to classicalness once you get above a certain number of atoms, or a truly distinct &#8220;classical realm.&#8221;<\/p>\n<p>Of course, no right-minded person really believes that there is a hard and fast transition to a classical realm once objects get big; rather, there is a sense in which the classical approximation becomes more and more accurate, but it&#8217;s always just an approximation. The experimental results here are simply affirming the truth of quantum mechanics. Nevertheless, you can still meet people (the wrong-minded ones) who are willing to believe that electrons and photons are governed by quantum mechanics, but not that <em>they<\/em> are governed by quantum mechanics. Have them watch this video, and hope that the implications sink in.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Caltech&#8217;s Institute for Quantum Information and Matter is a fun place. It&#8217;s led by people like John Preskill, Jeff Kimble, and Alexei Kitaev &#8212; some of the world&#8217;s great scientists &#8212; so you know the physics is going to be top-notch. But it&#8217;s the youngsters, such as postdoc Spiros Michalakis, who are bringing the fun. [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,31],"tags":[],"class_list":["post-11234","post","type-post","status-publish","format-standard","hentry","category-science","category-science-and-the-media"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/11234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/comments?post=11234"}],"version-history":[{"count":2,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/11234\/revisions"}],"predecessor-version":[{"id":11236,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/posts\/11234\/revisions\/11236"}],"wp:attachment":[{"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/media?parent=11234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/categories?post=11234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/preposterousuniverse.com\/blog\/wp-json\/wp\/v2\/tags?post=11234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}